To require no great torque during turning a threaded rod for increasing or decreasing a length.

This load holding device comprises a hollow rod 1 as one member, the threaded rod 2 as the other member arranged on an axial core portion of the hollow rod 1, and a nut 4 to be meshed with the threaded rod 2 while being linked to the hollow rod 1. As the hollow rod 1 is relatively moved with the turning of the threaded rod 2, the nut 4 is meshed with the threaded rod 2 in low-friction construction while another nut 11 linked to the hollow rod 1 is meshed with the threaded rod 2 with a gap S being formed by the arrangement of a spring member 12.